<%#
 Copyright 2010 Jo-Philipp Wich <jow@openwrt.org>
 Licensed to the public under the Apache License 2.0.
-%>

<%-
	local ntm = require "luci.model.network".init()

	local dev
	local devices = { }
	for _, dev in luci.util.vspairs(luci.sys.net.devices()) do
		if dev ~= "lo" and not ntm:ignore_interface(dev) then
			devices[#devices+1] = dev
		end
	end

	local curdev = luci.http.formvalue("dev") or devices[1]
-%>

<%+header%>

<script type="text/javascript" src="<%=resource%>/cbi.js"></script>
<script type="text/javascript">//<![CDATA[
	var bwxhr = new XHR();

	var G;
	var TIME = 0;
	var RXB  = 1;
	var RXP  = 2;
	var TXB  = 3;
	var TXP  = 4;

	var width  = 760;
	var height = 300;
	var step   = 5;

	var data_wanted = Math.floor(width / step);
	var data_fill   = 0;
	var data_stamp  = 0;

	var data_rx = [ ];
	var data_tx = [ ];

	var line_rx;
	var line_tx;

	var label_25;
	var label_50;
	var label_75;

	var label_rx_cur;
	var label_rx_avg;
	var label_rx_peak;

	var label_tx_cur;
	var label_tx_avg;
	var label_tx_peak;

	var label_scale;


	function bandwidth_label(bytes, br)
	{
		var uby = '<%:kB/s%>';
		var kby = (bytes / 1024);

		if (kby >= 1024)
		{
			uby = '<%:MB/s%>';
			kby = kby / 1024;
		}

		var ubi = '<%:kbit/s%>';
		var kbi = (bytes * 8 / 1024);

		if (kbi >= 1024)
		{
			ubi = '<%:Mbit/s%>';
			kbi = kbi / 1024;
		}

		return String.format("%f %s%s(%f %s)",
			kbi.toFixed(2), ubi,
			br ? '<br />' : ' ',
			kby.toFixed(2), uby
		);
	}

	/* wait for SVG */
	window.setTimeout(
		function() {
			var svg = document.getElementById('bwsvg');

			try {
				G = svg.getSVGDocument
					? svg.getSVGDocument() : svg.contentDocument;
			}
			catch(e) {
				G = document.embeds['bwsvg'].getSVGDocument();
			}

			if (!G)
			{
				window.setTimeout(arguments.callee, 1000);
			}
			else
			{
				/* find sizes */
				width       = svg.offsetWidth  - 2;
				height      = svg.offsetHeight - 2;
				data_wanted = Math.ceil(width / step);

				/* prefill datasets */
				for (var i = 0; i < data_wanted; i++)
				{
					data_rx[i] = 0;
					data_tx[i] = 0;
				}

				/* find svg elements */
				line_rx = G.getElementById('rx');
				line_tx = G.getElementById('tx');

				label_25 = G.getElementById('label_25');
				label_50 = G.getElementById('label_50');
				label_75 = G.getElementById('label_75');

				label_rx_cur  = document.getElementById('rx_bw_cur');
				label_rx_avg  = document.getElementById('rx_bw_avg');
				label_rx_peak = document.getElementById('rx_bw_peak');

				label_tx_cur  = document.getElementById('tx_bw_cur');
				label_tx_avg  = document.getElementById('tx_bw_avg');
				label_tx_peak = document.getElementById('tx_bw_peak');

				label_scale   = document.getElementById('scale');


				/* plot horizontal time interval lines */
				for (var i = width % (step * 60); i < width; i += step * 60)
				{
					var line = G.createElementNS('http://www.w3.org/2000/svg', 'line');
						line.setAttribute('x1', i);
						line.setAttribute('y1', 0);
						line.setAttribute('x2', i);
						line.setAttribute('y2', '100%');
						line.setAttribute('style', 'stroke:black;stroke-width:0.1');

					var text = G.createElementNS('http://www.w3.org/2000/svg', 'text');
						text.setAttribute('x', i + 5);
						text.setAttribute('y', 15);
						text.setAttribute('style', 'fill:#999999; font-size:9pt');
						text.appendChild(G.createTextNode(Math.round((width - i) / step / 60) + 'm'));

					label_25.parentNode.appendChild(line);
					label_25.parentNode.appendChild(text);
				}

				label_scale.innerHTML = String.format('<%:(%d minute window, %d second interval)%>', data_wanted / 60, 3);

				/* render datasets, start update interval */
				XHR.poll(3, '<%=build_url("admin/status/realtime/bandwidth_status", curdev)%>', null,
					function(x, data)
					{
						var data_max   = 0;
						var data_scale = 0;

						var data_rx_avg = 0;
						var data_tx_avg = 0;

						var data_rx_peak = 0;
						var data_tx_peak = 0;

						for (var i = data_stamp ? 0 : 1; i < data.length; i++)
						{
							/* skip overlapping entries */
							if (data[i][TIME] <= data_stamp)
								continue;

							/* normalize difference against time interval */
							if (i > 0)
							{
								var time_delta = data[i][TIME] - data[i-1][TIME];
								if (time_delta)
								{
									data_rx.push((data[i][RXB] - data[i-1][RXB]) / time_delta);
									data_tx.push((data[i][TXB] - data[i-1][TXB]) / time_delta);
								}
							}
						}

						/* cut off outdated entries */
						data_rx = data_rx.slice(data_rx.length - data_wanted, data_rx.length);
						data_tx = data_tx.slice(data_tx.length - data_wanted, data_tx.length);

						/* find peak */
						for (var i = 0; i < data_rx.length; i++)
						{
							data_max = Math.max(data_max, data_rx[i]);
							data_max = Math.max(data_max, data_tx[i]);

							data_rx_peak = Math.max(data_rx_peak, data_rx[i]);
							data_tx_peak = Math.max(data_tx_peak, data_tx[i]);

							if (i > 0)
							{
								data_rx_avg = (data_rx_avg + data_rx[i]) / 2;
								data_tx_avg = (data_tx_avg + data_tx[i]) / 2;
							}
							else
							{
								data_rx_avg = data_rx[i];
								data_tx_avg = data_tx[i];
							}
						}

						/* remember current timestamp, calculate horizontal scale */
						data_stamp = data[data.length-1][TIME];
						data_scale = height / (data_max * 1.1);


						/* plot data */
						var pt_rx = '0,' + height;
						var pt_tx = '0,' + height;

						var y_rx = 0;
						var y_tx = 0;

						for (var i = 0; i < data_rx.length; i++)
						{
							var x = i * step;

							y_rx = height - Math.floor(data_rx[i] * data_scale);
							y_tx = height - Math.floor(data_tx[i] * data_scale);

							pt_rx += ' ' + x + ',' + y_rx;
							pt_tx += ' ' + x + ',' + y_tx;
						}

						pt_rx += ' ' + width + ',' + y_rx + ' ' + width + ',' + height;
						pt_tx += ' ' + width + ',' + y_tx + ' ' + width + ',' + height;


						line_rx.setAttribute('points', pt_rx);
						line_tx.setAttribute('points', pt_tx);

						label_25.firstChild.data = bandwidth_label(1.1 * 0.25 * data_max);
						label_50.firstChild.data = bandwidth_label(1.1 * 0.50 * data_max);
						label_75.firstChild.data = bandwidth_label(1.1 * 0.75 * data_max);

						label_rx_cur.innerHTML = bandwidth_label(data_rx[data_rx.length-1], true);
						label_tx_cur.innerHTML = bandwidth_label(data_tx[data_tx.length-1], true);

						label_rx_avg.innerHTML = bandwidth_label(data_rx_avg, true);
						label_tx_avg.innerHTML = bandwidth_label(data_tx_avg, true);

						label_rx_peak.innerHTML = bandwidth_label(data_rx_peak, true);
						label_tx_peak.innerHTML = bandwidth_label(data_tx_peak, true);
					}
				);
			}
		}, 1000
	);
//]]></script>

<h2 name="content"><%:Realtime Traffic%></h2>

<ul class="cbi-tabmenu">
	<% for _, dev in ipairs(devices) do %>
		<li class="cbi-tab<%= dev == curdev and "" or "-disabled" %>"><a href="?dev=<%=pcdata(dev)%>"><%=pcdata(dev)%></a></li>
	<% end %>
</ul>

<embed id="bwsvg" style="width:100%; height:300px; border:1px solid #000000; background-color:#FFFFFF" src="<%=resource%>/bandwidth.svg" />
<div style="text-align:right"><small id="scale">-</small></div>
<br />

<table style="width:100%; table-layout:fixed" cellspacing="5">
	<tr>
		<td style="text-align:right; vertical-align:top"><strong style="border-bottom:2px solid blue"><%:Inbound:%></strong></td>
		<td id="rx_bw_cur">0 <%:kbit/s%><br />(0 <%:kB/s%>)</td>

		<td style="text-align:right; vertical-align:top"><strong><%:Average:%></strong></td>
		<td id="rx_bw_avg">0 <%:kbit/s%><br />(0 <%:kB/s%>)</td>

		<td style="text-align:right; vertical-align:top"><strong><%:Peak:%></strong></td>
		<td id="rx_bw_peak">0 <%:kbit/s%><br />(0 <%:kB/s%>)</td>
	</tr>
	<tr>
		<td style="text-align:right; vertical-align:top"><strong style="border-bottom:2px solid green"><%:Outbound:%></strong></td>
		<td id="tx_bw_cur">0 <%:kbit/s%><br />(0 <%:kB/s%>)</td>

		<td style="text-align:right; vertical-align:top"><strong><%:Average:%></strong></td>
		<td id="tx_bw_avg">0 <%:kbit/s%><br />(0 <%:kB/s%>)</td>

		<td style="text-align:right; vertical-align:top"><strong><%:Peak:%></strong></td>
		<td id="tx_bw_peak">0 <%:kbit/s%><br />(0 <%:kB/s%>)</td>
	</tr>
</table>

<%+footer%>
